My HP 1945 Pocket PC would not come on, just a blank screen. I "assumed" the backup battery was bad so I ordered, received, and replaced the main battery located under the mother board. After charging for 24 hours, I tried to start the PPC but the screen backlight came on and the "hp IPAQ Pocket PC" logo came on but nothing else. The PPC is not responding.Any suggestions? Did I remove all memory by removing the battery?Thanks